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Filename : pci.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *	pci.h
 *
 *	PCI defines and function prototypes
 *	Copyright 1994, Drew Eckhardt
 *	Copyright 1997--1999 Martin Mares <mj@ucw.cz>
 *
 *	For more information, please consult the following manuals (look at
 *	http://www.pcisig.com/ for how to get them):
 *
 *	PCI BIOS Specification
 *	PCI Local Bus Specification
 *	PCI to PCI Bridge Specification
 *	PCI System Design Guide
 */

#ifndef LINUX_PCI_H
#define LINUX_PCI_H

#include <linux/pci_regs.h>	/* The pci register defines */

/*
 * The PCI interface treats multi-function devices as independent
 * devices.  The slot/function address of each device is encoded
 * in a single byte as follows:
 *
 *	7:3 = slot
 *	2:0 = function
 */
#define PCI_DEVFN(slot, func)	((((slot) & 0x1f) << 3) | ((func) & 0x07))
#define PCI_SLOT(devfn)		(((devfn) >> 3) & 0x1f)
#define PCI_FUNC(devfn)		((devfn) & 0x07)

/* Ioctls for /proc/bus/pci/X/Y nodes. */
#define PCIIOC_BASE		('P' << 24 | 'C' << 16 | 'I' << 8)
#define PCIIOC_CONTROLLER	(PCIIOC_BASE | 0x00)	/* Get controller for PCI device. */
#define PCIIOC_MMAP_IS_IO	(PCIIOC_BASE | 0x01)	/* Set mmap state to I/O space. */
#define PCIIOC_MMAP_IS_MEM	(PCIIOC_BASE | 0x02)	/* Set mmap state to MEM space. */
#define PCIIOC_WRITE_COMBINE	(PCIIOC_BASE | 0x03)	/* Enable/disable write-combining. */

#endif /* LINUX_PCI_H */